Patents by Inventor Atsumi Hatano

Atsumi Hatano has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Steel for gear, gear superior in strength of tooth surface and method for producing same
    Patent number: 5595613
    Abstract: A steel for gears consists essentially of 0.10-0.30 wt % of C, not more than 1.0 wt % of Si, not more than 1.0 wt % of Mn, 1.50-5.0 wt % of Cr, and balance including iron and impurity. A gear made by the steel forms a hardened surface layer by carbonizing-hardening-tempering or carbonitriding-hardening-tempering. The amount of C at the hardened surface layer is within a range 0.7 to 1.3 wt %, and the amounts of C, Si and Cr satisfies a relationship 5.5<3.times.C (wt %)+5.2.times.Si (wt %)+Cr (wt %). Therefore, the gear performs superior pitting-resistance and wear-resistance.
    Type: Grant
    Filed: March 7, 1995
    Date of Patent: January 21, 1997
    Assignees: Nissan Motor Co., Ltd., Daido Steel Co., Ltd.
    Inventors: Atsumi Hatano, Sadayuki Nakamura, Makoto Yoshida, Yoshio Okada, Takashi Matsumoto